Fig. 8
From: Congenital systemic venous return anomalies to the right atrium review
Interruption of the infrarenal IVC with preservation of the suprarenal segment schematic. A rarer anomaly, subsequent to abnormal embryologic development of the posterior cardinal and supracardinal veins with resulting absence of the infrarenal segment of the IVC, in which the blood from the lower half of the body reaches the heart via the azygo-hemiazygos system of veins and prominent collateral vessels